On the effect of baryon loading in magnetized counterstreaming plasmas. I. Analytical investigation

2008 ◽  
Vol 74 (1) ◽  
pp. 79-90 ◽  
Author(s):  
R. C. TAUTZ ◽  
J.-I. SAKAI
Keyword(s):  
Magnetic Field ◽  
Growth Rates ◽  
Analytical Investigation ◽  
Linear Dispersion ◽  
Particle Species ◽  
Ion Plasma ◽  
Electron Positron ◽  
Background Magnetic Field ◽  
Unmagnetized Plasma ◽  
Homogeneous Background

AbstractAssuming a non-relativistic three species electron–positron–ion plasma, the counterstreaming instability is investigated for waves propagating parallel and perpendicular to a homogeneous background magnetic field. From the exact linear dispersion relations, it is shown analytically how the growth rates change with increasing baryon loading, revealing new characteristics that cannot be found either for an unmagnetized plasma involving three particle species or for a plasma with only two particle species.

On the effect of baryon loading in magnetized counterstreaming plasmas. II. Particle-in-cell simulations

2008 ◽  
Vol 74 (6) ◽  
pp. 815-826 ◽  
Author(s):  
R. C. TAUTZ ◽  
J.-I. SAKAI
Keyword(s):  
Magnetic Field ◽  
Particle In Cell ◽  
Particle Species ◽  
Ion Plasma ◽  
Electron Positron ◽  
Background Magnetic Field ◽  
Self Consistent ◽  
Homogeneous Background

AbstractAssuming a non-relativistic three species electron–positron–ion plasma, the counterstreaming instability is investigated for waves propagating parallel and perpendicular to a homogeneous background magnetic field. To support previous analytical investigations (Tautz and Sakai 2007), the instability is investigated by means of self-consistent particle-in-cell simulations. It is shown that the presence of a third particle species is responsible for a variety of new features that cannot be seen either from an electron–ion plasma or for an electron–positron plasma.

scholarly journals Heat flux effect in ηi-mode driven solitary and shock waves in electron-positron-ion plasma

2021 ◽  
Vol 49 (1) ◽  
Author(s):  
U. Zakir ◽  
◽  
K. Aziz ◽  
Q. Haque ◽  
A. Murad ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Flux ◽  
Density Ratio ◽  
Tokamak Plasma ◽  
Ion Temperature ◽  
Linear Dispersion ◽  
Ion Temperature Gradient ◽  
Ion Plasma ◽  
Electron Positron ◽  
Solitary And Shock Waves

The specific role of ion heat flux on the characteristics of the linear and nonlinear ion temperature gradient (ηi) driven mode in inhomogeneous electron-positron-ion plasma is presented. Inhomogeneity in density, temperature, and the magnetic field is considered. A modified linear dispersion relation is obtained, and its different limiting cases are when ηi 2/3, ωD(gradient in magnetic field) = 0 and β(density ratio of plasma species) = 1 are discussed. Furthermore, an expression for the anomalous transport coefficient of the present model is obtained. Nonlinear structure solutions in the form of solitons and shocks show that mode dynamics enhance in the presence of ion heat flux in electron-positron-ion plasma. The present study is essential in energy confinement devices such as tokamak because the heat flux observed experimentally in tokamak plasma is much higher than those described by collisions. Further, it could be helpful to understand the nonlinear electrostatic excitations in the interstellar medium.

scholarly journals Beltrami fields in a hot electron–positron–ion plasma

2012 ◽  
Vol 78 (3) ◽  
pp. 207-210 ◽  
Author(s):  
M. IQBAL ◽  
P. K. SHUKLA
Keyword(s):  
Magnetic Field ◽  
Plasma Flow ◽  
Strong Interaction ◽  
Field Configuration ◽  
Hot Electron ◽  
Magnetic Field Configuration ◽  
Beltrami Fields ◽  
Ion Plasma ◽  
Electron Positron ◽  
Laboratory Plasmas

AbstractA possibility of relaxation of relativistically hot electron and positron (e − p) plasma with a small fraction of hot or cold ions has been investigated analytically. It is observed that a strong interaction of plasma flow and field leads to a non-force-free relaxed magnetic field configuration governed by the triple curl Beltrami (TCB) equation. The triple curl Beltrami (TCB) field composed of three different Beltrami fields gives rise to three multiscale relaxed structures. The results may have the strong relevance to some astrophysical and laboratory plasmas.

scholarly journals Weak-field expansion for processes in a homogeneous background magnetic field

2000 ◽  
Vol 62 (10) ◽  
Author(s):  
Tzuu-Kang Chyi ◽  
Chien-Wen Hwang ◽  
W. F. Kao ◽  
Guey-Lin Lin ◽  
Kin-Wang Ng ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Weak Field ◽  
Background Magnetic Field ◽  
Homogeneous Background

scholarly journals Primordial Nucleosynthesis with a background magnetic field

2020 ◽  
Vol 227 ◽  
pp. 02003
Author(s):  
Yudong Luo ◽  
Toshitaka Kajino ◽  
Motohiko Kusakabe ◽  
Michael A Famiano
Keyword(s):  
Magnetic Field ◽  
Early Universe ◽  
Big Bang ◽  
Detailed Calculation ◽  
Big Bang Nucleosynthesis ◽  
Capture Reaction ◽  
Primordial Nucleosynthesis ◽  
Electron Positron ◽  
Background Magnetic Field ◽  
The Magnetic Field

We present our recent detailed calculation of the impacts from a background magnetic field on Big Bang Nucleosynthesis (BBN). Namely, the magnetic field impacts on the electron-positron thermodynamics, time temper-ature relation and the screening potential of the early Universe. Most interest-ingly, we investigated the electron-positron relativistic screening potential with the background magnetic field, such potential might lead to a non trivial effect on the electron capture reaction which could finally affect the neutron to proton ratio.

Oblique Propagation of Electrostatic Waves in a Magnetized Electron-Positron-Ion Plasma in the Presence of Heavy Particles

2018 ◽  
Vol 73 (6) ◽  
pp. 501-509 ◽  
Author(s):  
M. Sarker ◽  
M. R. Hossen ◽  
M. G. Shah ◽  
B. Hosen ◽  
A. A. Mamun
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Solitary Wave Solution ◽  
Heavy Ion ◽  
Nonlinear Propagation ◽  
Heavy Particles ◽  
Ion Plasma ◽  
Electron Positron ◽  
Electrons And Positrons ◽  
Basic Features

AbstractA theoretical investigation is carried out to understand the basic features of nonlinear propagation of heavy ion-acoustic (HIA) waves subjected to an external magnetic field in an electron-positron-ion plasma that consists of cold magnetized positively charged heavy ion fluids and superthermal distributed electrons and positrons. In the nonlinear regime, the Korteweg-de Vries (K-dV) and modified K-dV (mK-dV) equations describing the propagation of HIA waves are derived. The latter admits a solitary wave solution with both positive and negative potentials (for K-dV equation) and only positive potential (for mK-dV equation) in the weak amplitude limit. It is observed that the effects of external magnetic field (obliqueness), superthermal electrons and positrons, different plasma species concentration, heavy ion dynamics, and temperature ratio significantly modify the basic features of HIA solitary waves. The application of the results in a magnetized EPI plasma, which occurs in many astrophysical objects (e.g. pulsars, cluster explosions, and active galactic nuclei) is briefly discussed.

scholarly journals Beam instabilities in a magnetized pair plasma

1999 ◽  
Vol 62 (1) ◽  
pp. 65-86 ◽  
Author(s):  
MAXIM LYUTIKOV
Keyword(s):  
Growth Rates ◽  
Particle Interaction ◽  
Kinetic Regime ◽  
Pulsar Magnetosphere ◽  
Pair Plasma ◽  
Electron Positron ◽  
Pulsar Radiation ◽  
Radiation Generation ◽  
Field Lines ◽  
Beam Instabilities

Beam instabilities in the strongly magnetized electron–positron plasma of a pulsar magnetosphere are considered. We analyse the resonance conditions and estimate the growth rates of the Cherenkov and cyclotron instabilities of the ordinary (O), extraordinary (X) and Alfvén modes in two limiting regimes: kinetic and hydrodynamic. The importance of the different instabilities as a source of coherent pulsar radiation generation is then estimated, taking into account the angular dependence of the growth rates and the limitations on the length of the coherent wave–particle interaction imposed by the curvature of the magnetic field lines. We conclude that in the pulsar magnetosphere, Cherenkov-type instabilities occur in the hydrodynamic regime, while cyclotron-type instabilities occur in the kinetic regime. We argue that electromagnetic cyclotron-type instabilities on the X, O and probably Alfvén waves are more likely to develop in the pulsar magnetosphere.

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